osfmk/ipc/port.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55 /*
  56  *      File:   ipc/ipc_port.h
  57  *      Author: Rich Draves
  58  *      Date:   1989
  59  *
  60  *      Implementation specific complement to mach/port.h.
  61  */
  62
  63 #ifndef _IPC_PORT_H_
  64 #define _IPC_PORT_H_
  65
  66 #include <mach/port.h>
  67
  68 #define MACH_PORT_NGEN(name)            MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
  69
  70 /*
  71  *      Typedefs for code cleanliness.  These must all have
  72  *      the same (unsigned) type as mach_port_name_t.
  73  */
  74
  75 typedef mach_port_name_t mach_port_index_t;             /* index values */
  76 typedef mach_port_name_t mach_port_gen_t;               /* generation numbers */
  77
  78
  79 #define MACH_PORT_UREFS_MAX     ((mach_port_urefs_t) ((1 << 16) - 1))
  80
  81 #define MACH_PORT_UREFS_OVERFLOW(urefs, delta)                          \
  82                 (((delta) > 0) &&                                       \
  83                  ((((urefs) + (delta)) <= (urefs)) ||                   \
  84                   (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
  85
  86 #define MACH_PORT_UREFS_UNDERFLOW(urefs, delta)                         \
  87                 (((delta) < 0) && (-(delta) > (urefs)))
  88
  89 #endif  /* _IPC_PORT_H_ */